Twisting frame



H. BACHOFEN TWISTING FRAME Nov. 24, 1953 Filed Jan. 12, 1950 Patented Nov. 24,1953

STATS ATENT OFFICE Claims priority, application Switzerland November 26, 1949 8 Claims. (01. 57-71) This invention relates to a twisting apparatus. It is the primary object of the invention to provide means for increasing the production of such an apparatus.

To this end, according to the invention, the movable parts of a twisting frame of symmetric design are arranged concentrically to the shaft thereof, and a thread guide which is arranged symmetrically to the shaft of the twisting frame is axially reciprocated in relation to an axially fixed bobbin. Moreover, a reversing shaft for reciprocating the thread guide and the shaft of the twisting frame are concentric with respect to each other and located about a shaft carrying the bobbin and interconnected. with the other shafts by a planetary gear system, the reversing shaft supporting the planetary wheels of this system.

The drive of the thread guide from the shaft carrying the bobbin through the planetary gear system insures a uniform pitch of the woundup twisted yarn, independently of the constantly changing bobbin diameter. The concentrically telescoped arrangement of the shafts along the axis of the twisting frame permits a better utilization of the bobbin space. The connection of the shafts through the planetary gear system results in a substantial suppression of non-uniform thread movements and hence in constant contact between the yarn and feed roller, so that an extremely uniform twisted yarn is produced.

The planetary gear system, moreover, ensures a constant transmission ratio between the twisting frame and the reversing shaft on the one hand and between the latter and the shaft carrying the bobbin on the other hand.

In known twisting machines the. thread guide is driven by a reversing spindle disposed outside of the axis of the twisting frame and parallel to the shaft of the twisting frame.

' In the drawing the mechanism of the twisting apparatus is shown schematically in a perspective view, partly in section. a

In a machine casing (not shown in the drawing) there is mounted a main, hollow shaft l which supports the twisting frame 2. The main shaft i is driven by a rotated shaft 3 through the me- 7 dium of belt 4i and pulleys 5 and 6. The shaft 3 is driven by a belt 8 running over a belt pulley 'l which is keyed on this shaft. The operation of the machine in both directions of rotation is produced by any suitable known means. Two thread guides H are longitudinally and slidably guided in the twisting frame, in two tubular guides Iii each of which has a longitudinal slot 9 facing towards the axis of the twisting frame, these slots being arranged symmetrically with respect to the main shaft l. The thread guides each support at their free ends a thread guide roller l2, while their other ends are fastened to arms l3 engaging, by slide blocks i l arranged at their inner ends, in reversing, intersecting threads E5 of a reversing shaft 86. The reversing shaft it is designed as a hollow shaft and is mountedconcentrically through the main shaft which takes the form of hollow hubs of the twisting frame 2. concentrically mounted within the reversing shaft is a braking shaft if on the inner end of which the bobbin I8 is mounted so as to be easily interchangeable. A driving pin I9 is provided on the bobbin, this driving pin engaging in a cutout of a driving disc 28 mounted on the braking shaft. The braking shaft is driven by adrivingbelt 2| through belt pulleys 22, 23. Mounted on the main shaft l is a disc 25 provided with an inner toothed rim 2%. Planetary wheels 21 (only one of which is illustrated for simplicitys sake) are mounted on a flange 26 of the reversing shaft it, each planetary wheel being rotatable on a shaft 23 and meshing with the inner toothed rim 24 of the disc 25. The planetary wheels 21 moreover mesh with a toothed wheel 29 fixedly mounted on shaft ll. Through a part of the main shaft l extends a hollow feed shaft 30 through which the twisted yarn 40 is introduced into the twisting frame. The feed shaft'is driven by a belt 3! through belt pulleys 32, .33. A twisting nozzle is is mounted before the feed shaft in axial alignment therewithand a perforated distributing plate 35 is fixedly arranged on the machine casing before the twisting nozzle in spaced relationship thereto. Located opposite the inner side of the left end wall of the twisting frame 2, as viewed in the drawing, is a feed roller 36 fixed to the shaft 36 for rotation therewith and having a plurality of grooves. Return rollers 37 are rotatably mounted onshafts 38, symmetrically to the feed roller 36, at the inner side of the said end wall of the twisting frame, said return rollers also being formed with. V-shaped grooves. Supported in each of the guides iii, adjacent the left open end, as viewed in the drawing, is a thread guide roller 39. 'The threads coming from the distributing plate 35 and introduced through the twisting nozzle it are combined to a twisted yarn t0 within the feed shaft 39. This twisted yarn is first passed over one of the return rollers'3l.

and then successively and repeatedly over the feed roller 36 and the return roller 31; Then the.

twisted yarn is passed through the longitudinal slit 9 of a guide l0, over the thread guide, and on to the bobbin.

When the machine is operated, the twisting frame 2, the bobbin I3, and the feed roller 36 are rotated in the same direction at difierent speeds. The twisted yarn is introduced into the twisting frame by feed roller 36 and the thread guide rollers 39 and I2. By the planetary gear system 24, 21, 29 a constant transmission ratio is attained between the twisting frame 2 and the reversing shaft 16 on the one hand and between the reversing shaft and the braking shaft H on the other hand. This is evident if one considers the fact that, on the one hand, the shaft and the gear 24 therewith are rotated at one speed by the belt 4 and pulleys and 6, while, on the other hand, the shaft H and the gear 29 therewith are rotated by the belt 2| and pulleys 22 and 23 at another speed different from the speed of rotation of shaft I and gear 24. The planetary gears 21 mesh with the gears 29 and 24 so that the shaft l6, which turns with the planetary gears about the axis of shaft necessarily rotates at a speed which is always at a predetermined ratio to the speed of rotation of shaft II, on the one hand, and the speed of rotation of the shaft and the twisting frame 2 therewith, on the other hand. A tension roller (not shown in the drawing) acts upon the belt 2| to form an overrunning brake and produces a braking by slip of the belt 2| so as to prevent overrunning. Since the drive of the thread guide is derived from the braking shaft, a uniform pitch of the wound up twisted yarn is attained independently of the continuously changing diameter of the bobbin. Since the bobbin is rotated without axial shifting while the thread guide is axially reciprocated, a better utilization of the capacity of the bobbin, a substantial suppression of non-uniform thread motions and thus constant thread contact with the feed roller is attained, so that an extremely uniform twisted yarn is produced.

The twisting machine as hereinbefore described is suitable for all twisting operations such, as for instance, for the manufacture of binder twine, fancy twist, the working of cotton, hemp, nylon, paper, etc.

While the invention has been described in detail with respect to a now preferred example and embodiment of the invention, it will be understood by those skilled in the art, after understanding the invention, that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended, therefore, to cover all such changes and modifications in the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In a twisting device, apparatus for winding the twisted thread onto a winding bobbin, comprising in combination, a rotatably mounted shaft fixedly connected to the winding bobbin for rotating the same; a thread guidemeans located adjacent to the winding bobbin and mounted for rotation and translation so as to guide the twisted thread onto the winding bobbin; moving means separate from said first shaft and being operatively connected to said thread guide means for moving the same in translation; first drive means operatively connected to said rotatably mounted shaft for rotating the same; second drive means operatively connected to said thread guide means for rotating the same at a speed different from the speed of rotation of said shaft; and transmission means interconnecting said'second drive means and said moving means for actuating said moving means to move said thread guide means in translation for guiding the twisted thread along the length of the winding bobbin.

2. In a twisting device, apparatus for winding the twisted thread onto a winding bobbin, comprising in combination, a first rotatably mounted shaft fixedly connected to the winding bobbin for rotating the same; thread guide means located adjacent to the winding bobbin and mounted for rotation about the axis of said first shaft and for translation in a direction substantially parallel to the axis of said first shaft so as to guide the twisted thread onto the winding bobbin; a second shaft, said second shaft being hollow and having an internal diameter which is substantially larger than the diameter of said first shaft, and said second shaft being mounted for rotation concentrically about said first shaft so that said second shaft is spaced from said first shaft, the outer surface of said second shaft being formed with a pair of oppositely directed intersecting threads; slide means engaging said threads and being slidably mounted on said second shaft so as to be moved in translation on said shaft by said threads, said slide means being fixedly connected to said thread guide means so as to move the latter in translation; first drive means operatively connected to said first shaft for rotating the same; second drive means operatively connected to said thread guide means for rotating the same at a speed different from the speed of rotation of said first shaft; and transmission means interconnecting said second drive means and said second shaft for rotating the latter at a speed different from the speeds of rotation of said first shaft and thread guide means.

3. In a twisting device, apparatus for winding the twisted thread onto a winding bobbin, comprising in combination, a first rotatably mounted shaft fixedly connected to the winding bobbin for rotating the same; thread guide means located adjacent to the winding bobbin and mounted for rotation about the axis of said first shaft and for translation in a direction substantially parallel to the axis of said first shaft so as to guide the twisted thread onto the winding bobbin; a second shaft, said second shaft being hollow and having an internal diameter which is substantially larger than the diameter of said first shaft and said second shaft being mounted for rotation concentrically about said first shaft so that said second shaft is spaced from said first shaft, the outer surface of said second shaft being formed with a pair of 0ppositely directed intersecting threads; slide means engaging said threads and being slidably mounted on said second shaft so as to be moved in translation on said shaft by said threads, said slide means being fixedly connected to said thread guide means so as to move the latter in translation; first drive means operatively connected to said first shaft for rotating the same; second drive means operatively connected to said thread guide means for rotating the same at a speed different from the speed of rotation of said first shaft; and transmission means interconnecting said thread guide means and second shaft for rotating the latter in response to rotation of said thread guide means and at a speed different from the speeds of rotation of said first shaft and said thread guide means, said transmission means comprising a first gear member connected to said thread guide means for rotation with the same; a second gear member connected to said first shaft for rotation with the same; and at least one planetary gear mounted on said second shaft for rotation about an axis substantially parallel to the axis of said nrst shart and meshing with said first and second gear members so as to be rotatedby the same and thereby rotate said second shaft.

4. In a twisting device, a rotatably mounted winding bobbin; twisting frame means mounted for rotation about said winding bobbin'and comprising at least one elongated tubular arm extending in a direction substantially parallel to the axis of rotation of the Winding bobbin and being formed with an elongated slot in a part thereof adjacent to said winding bobbin; a first guide roller rotatably mounted in said tubular arm ad acent an end thereof; and thread guide means comprising an elongated member mounted within said tubular arm for movement therealong, said elongated member having a second guide roller rotatably supported thereon adjacent an end thereof, whereby, thread may be guided over said first and second guide rollers and through said slot to said winding bobbin, said tubular arm'serving to maintain the thread in contact with said guide rollers.

5. A'twisting device, comprising in combination, a first shaft mounted for rotation about its axis; a winding bobbin connected to said first shaft for rotation therewith and being mounted concentrically with the same; a symmetrically constructed twisting frame located about said first shaft and winding bobbin for rotation about an axis coincident with the axis of said first shaft; a feed roller mounted for rotation about an axis coincident with the axis of said first shaft; a set of additional rollers mounted for rotation about axes parallel to the axis of said first shaft, said set of additional rollers being symmetrically located with respect to said feed roller; a second shaft, said second shaft being hollow and concentrically located about said first shaft for rotation about the axis thereof, said second shaft having a pair of oppositely directed threads formed on the outer surface thereof; and thread guide means operatively connected to said twisting frame and said threads on the outer surface of said second shaft for movement in rotation with said twisting frame and for movement in translation with respect to said twisting frame, said thread guide means being symmetrically constructed with respect to the axis of said first shaft, whereby when the twisting device is operated at a relatively high speed so as to have a high production rate, the symmetrical construction of the parts thereof prevent unbalanced centrifugal forces from being set up.

6. A twisting device, comprising in combination, a first shaft mounted for rotation about its axis; a winding bobbin connected to said first shaft for rotation therewith and being mounted concentrically with. the same; a symmetrically constructed twisting frame located about said first shaft and winding bobbin for rotation about an axis coincident with the axis of said first shaft; a feed roller mounted for rotation about an axis coincident with the axis of said first shaft; a set of additional rollers mounted for rotation about axes parallel to the axis of said first shaft, said set of additional rollers being symmetrically located with respect to said feed roller; a second shaft, said second shaft being hollow and concentrically located about said first shaft for rotation about the axis thereof and said second shaft having an internal diameter substantially greater than the diameter of said first shaft so that second shaft is out of contact with said first shaft, said second shaft having a pair of oppositely directed threads formed on the outer surface thereof; and thread guide means operatively connected to said twisting frame and said threads on the outer surface of said second shaft for movement in rotation with said twisting frame and for movement in translation with respect to said twisting frame, said thread guide means being symmetrically constructed with .respect to the axis of said first shaft, whereby when the twisting device is operated at a relatlvely high speed so as to have a high production rate, the symmetrical construction of the parts thereof prevent unbalanced centrifugal forces from bein set up.

7. A twisting device, comprising in combination, a first shaft mounted for rotation about its axis; a Winding bobbin connected to said first shaft for rotation therewith and being mounted concentrically with the same; a symmetrically constructed twisting frame located about said first shaft and winding bobbin for rotation about an axis coincident with the axis of said first shaft; a feed roller mounted for rotation about, an axis coincident with the axis of said first shaft; a set of additional rollers mounted for rotation about axes parallel to the axis of said first shaft, said set of additional rollers being symmetrically located with respect to said feed roller; a second shaft, said second shaft being hollow and concentrically located about said first shaft for rotation about the axis thereof and said second shaft having an internal diameter substantially greater than the diameter of said first shaft so that second shaft is out of contact with said first shaft, said second shaft having a pair of oppositely directed threads formed on the outer surface thereof; thread guide means operatively connected to said twisting frame and said threads on the outer surface of said second shaft for movement in rotation with said twisting frame and for movement in translation with respect to said twisting frame, said thread guide means being symmetrically constructed with respect to the axis of said'first shaft, whereby when the twisting device is operated ata relatively high speed so as to have a high production rate, the symmetrical construction of the parts thereof prevent unbalanced centrifugal forces from being set up; first drive means connected to said first shaft for rotating the same; second drive means connected to said twisting frame for rotating the same at a speed different from the speed of rotation of said first shaft; and transmission means interconnecting said twisting frame and second shaft for rotating the latter in response to rotation of said twisting frame at a speed different from the speeds of rotation of said twisting frame and first shaft.

8. A twisting device, comprising in combination, a first shaft mounted for rotation about its axis; a winding bobbin connected to said first shaft for rotation therewith and being mounted concentrically with the same; a symmetrically constructed twisting frame located about said first shaft and winding bobbin for rotation about an axis coincident with the axis of said first shaft; a feed roller mounted for rotation about an axis coincident with the axis of said first 7 shaft; a set. of additional rollers mounted for rotation about axes parallel to, theraxis of said first shaft, said set of additional rollers bein symmetrically located with respect to said feed roller; a second shaft, said second shaft bein hollow and concentrically located about said first shaft for rotation about the axis thereof and said second shaft having an internal diam= eter substantially greater than the diameter of said first shaft so that second shaft is. out of contact with said first shaft, said second shaft having a pair of oppositely directed threads formed on the outer surface thereof; thread guide means operatively connected to said twisting frame and said threads on the outer surface of said second shaft for movement in rotation with said twisting frame and for movement in translation with respect to said twisting frame, said thread guide means being symmetrically constructed with respect to the axis of saidv first shaft, whereby when the twisting device is op erated at a relatively high speed so as to have a high production rate, the symmetrical con: struction of the parts thereof prevent unbalanced centrifugal forces from being set up; first drive means connected to said first shaft for rotating the same; second drive means connected to said twisting frame for rotating the same at a speed different from the speed of rotation of said first 8 shaft; and transmission'means interconnecting said'tw-isting frame and second shaft for rotating the latter in response to rotation of said twisting frame at a speed different from the speeds of rotation of said twisting frame and first shaft, said transmission means comprising a first gear member fixedly connected to said twisting frame so as to rotate with the same, a second gear member fixedly connected to said first shaft so as to rotate with the same, and at least one planetary gear mounted on said second shaft for rotation about an axis parallel to the axis of said first shaft and meshing with said first and second gear members.

HANS BACHOFEN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 500,062 Good c June 20, 1893 604,614; Hansen May 24, 1898 1,427,667 Whitcomb Aug. 29, 1922 1,382,909 Calkins Feb. 5, 1924 ,585,134 Van Hook May 18, 1926 FOREIGN PATENTS Number Country Date 12,630 Great Britain of 1914 

